[PATCH] serial 8250.c: size_fifo tries to read write-only FCR register

The function size_fifo wants to backup the FCR register by reading it, but
it is a write-only register. A read to this adress returns the IIR register.
The size_fifo function is only used during autoconfig, and after autoconfig
the FIFO are cleared and deactivated, so we don't need to save FCR.

Signed-off-by: Jean-Baptiste Maneyrol <jean-baptiste.maneyrol@xxxxxxxxxxx>

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serial8250-size_fifo-bug.patch
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